Deadlift form check

[nisora33]

Rip:

Thanks for your time.

I've got a deadlift form check. This is my third time doing 270 lbs trying to keep better back extension but still failing to do so on the 4TH and 5th reps. In the video, you'll see that I'm using the sumo deadlift stance you told me to adopt at the certification a few weeks back.
I wasn't comfortable adding any weight to it the last couple of times due to failure at back extension. These still felt REALLY heavy.

Video will go to fullscreen: http://www.vimeo.com/2500708

I'm doing a novice program that looks like this:

Mon.
squats
press/bench
powerclean
chinups

Wed.
squats
bench/press
deadlift

Fri.
squats
press/bench
powercleans
chinups

I deadlift once a week, always on Wednesdays. Is my deadlift maybe a case of the "perfect is the enemy of the good?"

Cheers,
Stacey

[Mark Rippetoe]

Quiz time: Do you see the bar moving forward as it leaves the floor? With the information you've got, you tell me what might make this happen.

[nisora33]

Too much of me is in front of the bar. The bar goes forward to move directly underneath the scapula, where it should have been in the first place. A little more knee bend/getting the hips lower (however you'd wanna think of it) at the get-go should take care of this.

At any rate, is this much spinal flexion late in a heavy workset always to be feared and avoided? Of course, better form in the above video might've improved my leverage against the bar enough that I could have kept a neutral spine throughout.

[Mark Rippetoe]

That would be my analysis. And at heavy weights there might be a little spinal unlock, even with a sumo. Yours is not excessive.